Severe Anemia, excess gas, hyperacidity.

My mother has been suffering from severe anaemia and hyperacidity. She has been taking ferrous ascorbate, folic acid, zinc tablets 2 times daily for more than 2 years still her haemoglobin level remains below 8 g/dl. Excess gas in the intestine was detected in ultrasound abdomen test. Endoscopy report shows acute gastric errosions. Multiple erosions seen in the fundus, body and antrum of the stomach.            Patient's medical history: Around 15-16 years ago she had gallbladder surgery. She has also been taking antacids for a very long time. Visited number of medicine doctors and done lots of medical tests. Had 3 units of blood transfusions in Jan 2021 when haemoglobin reached a critically low level 4.3 g/dL and 2 units in June 2023 when haemoglobin level was 6.3 g/dL. Kindly suggest medicine to heal the gastric errosions in the stomach and absorb iron better.